file_path: networkx/networkx/linalg/tests/test_graphmatrix.py
imports: import pytest
  import networkx
  from networkx.exception import NetworkXError
  from networkx.generators.degree_seq import havel_hakimi_graph
label_desc: Use image node_id 1 for calling the TestGraphMatrix obj's underlying member method code with example usage: obj.setup_class(cls) without return types